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Патент USA US3031257

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April 24, 1962
3,031,241
T. c. WALDROP
SWAB RUBBER UNIT FOR WELL SWAB
Filed May 4, 1961
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THOMA 5
C. WAL DROP
IN VEN TOR.
United States Patent '@
a
3,031,241
Patented APY- 24: 1962
1
2
or tubing, due to the sealing rings in this invention being
prevented at all times from assuming the position 3 or
“overloaded” position taught as desirable by Webber.
In a copending application, Serial No. 107,845 ?led
concurrently herewith, I have shown and described three
separate forms of the invention in which the central tubu
3,031,241
Thomas C. Waldrop, Arlington, Tern, assignor to Empire
SWAB RUBBER UNIT FOR WELL SWAB
Rubber Co., Grapevine, Tex., a corporation oi‘ Texas
Filed May 4, 1961, Ser. No. 107,846
3 Claims. (Cl. 309-52)
lar core as well as the ?exible sealing rings or cups and
the annular reinforcing or back up ribs below them are of
This invention relates to a well swab adapted to be
lowered in a well pipe or tubing on a wire line and to
molded rubber construction.
,
,
This application relates to still another form of the in
vention in which the central tubular core comprises a
swab therein, and it concerns more particularly a swab
metal sleeve having the ?exible sealing rings or cups
rubber unit for such a swab as hereinafter described.
molded thereon and having the annular reinforcing or
The swab rubber unit of this invention is an improve
back up ribs below the respective sealing rings or cups,
ment over the swab rubber unit for well swabs of the
type generally shown and described in Patent No. 2,633, 15 which in the form shown are rigid, formed integrally
therewith.
808, April 7, 1953, issued to Jack C. Webber.
The invention will be readily understood by referring to
The Webber patent above referred to shows, FIGS. 1
the following description and the accompanying draw
to 4, a well swab having a swab rubber unit which is
ing, in which:
molded of resilient material, such as rubber, and has a
plurality of longitudinally spaced inverted frusto-conical, 20 FIG. 1 is an elevational view, partly in section taken on
elevate well ?uids in the pipe or tubing upon raising the 10
radially outwardly and upwardly inclined ?exible annular
a median line, showing a swab under no load but opera
rib-like sealing rings or cups formed on a central tubular
core which, as shown, is bonded directly to a mandrel
tively positioned in a well pipe or tubing, the swab includ
ing a mandrel having a swab rubber unit embodying this
forming a structural part of the swab, but which in prac~
invention received thereon, and showing the ?exible seal
tice may be also formed on a separate sleeve receivable on 25 ing rings or cups, which are reinforced or backed up by
the annular ribs below them, at rest.
FIG. 2 is an elevational view, partly in section taken
on a median line, showing fragmentarily the apparatus
such a mandrel whereby the swab rubber unit, together
with the sleeve, is expendable.
An advantageous feature of the swab rubber unit shown
in the Webber patent, as compared to swab rubber units
illustrated in FIG. 1, and showing the ?exible sealing
previously employed having large wire reinforced single
rings or cups in loaded positions.
'
_
,
Referring to FIG. 1 of the drawing, the numeral 1
cups designed to carry the entire load of ?uids being dis
placed from a well pipe or tubing, and which are charac
designates generally a well swab which is similar to the
terized by their in?exibility, is that the swab rubber unit
swab shown in Patent No. 2,919,167, December 29, 1959,
issued to Raymond G. Taylor, Jr., and which is opera~
shown in the patent, because of its ?exibility, is less likely
to be damaged upon impact with ?xed objects which may 35 tively positioned in a well pipe or tubing, indicated by
obstruct its free movement thru the well pipe or tubing.
Another advantageous feature of the arrangement
shown in the patent is that the rib-like sealing rings or
cups, which are of slightly less diameter than the well
pipe or tubing but are normally inclined radially out 40
the numeral 2.
The swab 1 includes a mandrel 3 having swab rubber
wardly and upwardly, whereby the swab may be readily
units embodying this invention, as hereinafter described,
two of which are shown, each designated generally by the
numeral 4, received thereon.
The mandrel 3 includes an elongated body 5 having
lowered in a well pipe or tubing, are each designed to
resist predetermined pressure differentials on opposite
secured to its upper extremity a connector head 6 which
is removably connected to a wire rope socket 7, shown
sides thereof, so that each carries its proportionate share
fragmentarily.
The connector head 6 is provided with
of the load of a column of ?uid in the well pipe or tubing. 45 arcuately convergent surfaces 8 leading to radially ex
The sealing rings described in the Webber patent are
designed to occupy, during various phases of operational
loading, all of the following positions:
tending stop shoulders 9 at the lower extremity of the
connector head 6.
'
On the lower end of the mandrel body 5 is a guide nose
10 having a seating surface 11 at its upper end, and hav
(1) A position at rest in which the sealing rings are not
in contact with the tubing wall,
50 ing a plurality of circumferentially spaced ribs 12 and
(2) A position caused by intermediate or optimum
?utes 13 disposed about its periphery for enabling the ?ow
loading, in which the sealing rings are de?ected down
of ?uid therepast as the swab 1 is being run into the well
wardly and outwardly to contact the tubing wall and are
pipe or tubing 2.
substantially perpendicular to the tubing wall,
The body 5 of the mandrel 3 is provided with a suitable
(3) A position caused by loading in excess of the de 55 number of eircumferentially spaced longitudinally ex
sign capacity of the sealing rings, in which they are ?exed
tended ribs 14 and includes channels 15 providing ?ow
downwardly from the position 2 described above.
passages between the ribs 14.
An object of this invention is to provide an improved
The swab rubber units 4 each include a central tubular
swab rubber unit having incorporated therein all of the
core 16, which is formed of metal and-is centered about
advantages and safety of the arrangement taught by the 60 the body 5 by the ribs 14.
Webber patent, while at the same time being character
The central tubular core 16, which is formed of metal,
ized by its substantially greater lifting capacity.
This invention contemplates a swab rubber unit in which
a series of radially outwardly extending annular ribs, of
smaller diameter than the rib-like sealing rings or cups,
are formed on the central tubular core, immediately be
low the sealing rings or cups, respectively, for abutment
against the under sides of the sealing rings or cups to re
sist downward ?exing movement thereof, whereby the
or other rigid or semi-rigid material, and which corre
sponds to the central tubular core of the swab rubber
unit shown in the Webber patent, FIGS. 1 to 4, has a
*' plurality of longitudinally spaced ?exible, radially out
wardly and upwardly inclined rib-like sealing rings or
cups 17, formed of molded resilient material such as rub
ber, corresponding to the ?exible sealing rings or cups
shown in the Webber patent, formed thereon.
In their at rest positions, as shown in FIG. 1, the ?exi
sealing rings or cups are reinforced or backed up by the 70
ble sealing rings or cups 17 have a diameter slightly less
annular ribs below them and are thereby adapted to lift
than the diameter of the well pipe or tubing 2.
greater loads upon movement of the swab in a well pipe
3,031,241
4
A series of radially outwardly extending annular ribs
18, of smaller diameter than the ?exible sealing rings or
cups 17, are formed on the central tubular core 16, in
tegrally therewith, immediately below the sealing rings
or cups 17, respectively; for abutment against the under
sides of the sealing rings or cups 17 to resist downward
?exing movement thereof, whereby the sealing rings or
cups 12 are reinforced or backed up by the annular ribs
The invention may be modi?ed in various ways with
out departing from the spirit and scope thereof.
I claim:
1. In a swab rubber unit for a well swab, the combina
tion of a central tubular core having a plurality of longi
tudinally spaced, ?exible rib-like sealing rings or cups
formed thereon and inclined radially outwardly and up
wardly therefrom, the ?exible sealing rings or cups having
18 below them and are thereby adapted to lift greater
a diameter in their at rest positions corresponding sub
loads upon upward movement of the swab 1 in the well 10 stantially to the diameter of a well pipe or tubing, and a
pipe or tubing 2.
series of radially outwardly extending annular ribs, of
The portions of the ?exible sealing rings or cups 17
smaller diameter than the well pipe or tubing, formed on
which extend radially outwardly beyond the annular ribs
the central tubular core, immediately below the sealing
18, being relatively short, are characterized by their rela
rings or cups, respectively, for abutment against the
tive stiffness whereby they resist downward ?exing.
under sides of the sealing rings or cups to resist down
The annular reinforcing or back up ribs 18 are char
ward ?exing movement thereof, the central tubular core
acterized by planar upper faces which extend radially out
comprising a metal sleeve having the ?exible sealing
wardly from the central tubular core 16, perpendicular to
rings or cups molded thereon and having the annular ribs
its longitudinal axis, and as viewed in sectional elevation,
formed integrally therewith.
intersect the under sides of the corresponding ?exible 20
2. The structure of claim 1, the annular ribs being
sealing rings or cups 17 at acute angles.
characterized by planar upper faces which extend radially
The annular reinforcing or back up ribs 18, because of
outwardly from the central tubular core, perpendicular
their relatively rigid construction, positively limit down~
to its longitudinal axis, and as viewed in sectional eleva
ward ?exing movement of the ?exible sealing rings or cups
tion, intersect the under sides of the corresponding ?exi
17, and because of their smaller diameter they do not 25 ble sealing rings or cups at acute angles.
frictionally engage the well pipe or tubing 2 upon moving
3. The structure of claim 1, the ?exible sealing rings
the swab 1 upwardly therein.
or cups being formed of molded resilient material and the
For convenience in manufacturing, the exterior surface
annular ribs being formed of the metal of the sleeve, the
of the central tubular core 16, including opposite ends
exterior surface of the central tubular core, including the
thereof, the annular metal ribs 18, and the space between
opposite ends thereof, the annular ribs, and the space
the annular metal ribs 18 and the ?exible sealing rings
between the annular ribs and the ?exible sealing rings or
or cups 17, advantageously may be completely enclosed
cups being completely enclosed in a continuous web or
in a continuous web or sheath 19, of variable thickness, of
sheath, of variable thickness, of molded resilient material.
molded resilient material such as rubber, which comprises
No references cited.
the material of the ?exible sealing rings or cups 17.
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